Gun Tests seems well intentioned, but peculiar. They are not biased by advertising and they buy their guns various places, sometimes from the maker, sometimes from stores.
The problem with GT is their lack of consistency between tests for similar guns in different issues, lack of consistency in how they evaluate guns (what determines their final rating and why), and a lack of consistency in the accuracy of what they report. Similar full size pistols, for example, may be tested at 10, 15, 20, and 25 yards, or 25, 30, and 50 feet. So the respected 1" grouping for a gun in one issue may not be the same 1" group in another when you realize that one was shot at 15 yards and the other as 30 feet.
A gun can function well, be accurate, etc., but if the reviewers don't like it, they will down rate it even if it did betters in the group they tested. I have seen this with one pistol for which none of the people who shot it said it fit their hand very well, but it shot the best and had no malfunctions. This was also the case with the Beretta Storm carbine compared to the Olympic AR15 in 9mm or .40. The Olympic wasn't as accurate and had some malfunction problems, but because the GT folks didn't like how the Storm was setup, they rated the Olympic higher and said they thought that some ammo could be found to run well and accurately in the gun. What? So the Olympic was given a higher rating because they liked the AR15 layout better, even though they could not make it run better or more accurately than the Storm. Weird.
They have also been caught several times making glaring mistakes in their descriptions of the guns being tested such as listing wrong models, wrong weights, wrong lengths, etc.
Also, as a Gun Tests magazine, why they have a section by Todd Woodward (Woodard?) on political issues and other related news is beyond me. They have left that in, but seem to have taking out Firing Line comments from readers that note mistakes.
GT means well, but comes up with some weird results that may or may not be any more useful than what you get in the shiny newstand magazines where you see a glowing review of a gun in the same issue where there is lots of full page advertising for that very gun or brand.